So I had a computer built on a website a few weeks ago and I bought a video card separately on Amazon. Computer runs great when it's on but anytime I reboot, my pc hangs at the Windows start up screen. I removed the video card and have no problems when it's not installed.
I installed my video card into my fiancee's computer and it works great, no start up issues. I install my fiancees video card on my pc and the start up problems persist. It's not the video card. What is the most likely culprit?